Structural Diversity of the Oxovanadium Organodiphosphonate System: A Platform for the Design of Void Channels
作者:Wayne Ouellette、Ming Hui Yu、Charles J. O'Connor、Jon Zubieta
DOI:10.1021/ic0517422
日期:2006.4.17
oxovanadium diphosphonate framework in the type 4 materials [H3N(CH2)(n)NH3][V4O4(OH)2 O3P(CH)3PO3}2] x xH2O [n = 2, x = 6 (4a); n = 3, x = 3 (4b); n = 4, x = 2 (4c); n = 5, x = 1 (4d); n = 6, x = 0.5 (4e); n = 7, x = 0 (4f)] and [H3NR]y[V4O4(OH)2 O3P(CH)3PO3}2] x xH2O [R = -CH2(NH3)CH2CH3, y = 1, x = 0 (4g); R = -CH3, n = 2, x = 3 (4h); R = -CH2CH3, y = 2, x = 1 (4i); R = -CH2CH2CH3, y = 2, x = 0 (4j);
钒源,适当的二膦酸酯配体和水在HF存在下的水热反应提供了一系列具有中性VPO网络的化合物,这些化合物是重复出现的结构基序。当O3P(CH2)(n)PO3} 4-二膦酸酯系链的长度n为2-5时,类型为[V2O2(H2O)O3P(CH2)(n)PO3}] x xH2O的金属氧化物杂化物,被隔离。1型氧化物表现出典型的三维(3-D)“柱状”层结构。当n增加到6-8时,会遇到2型氧化物[V2O2(H2O)4 O3P(CH2)6PO3}]的二维(2-D)“成柱状”平板结构。将间隔物进一步加长至n = 9,可提供另一种3-D结构,类型3,该结构由柱状平板的缩合构成,以提供VPO双层作为网络子结构。当引入有机阳离子为阴离子VPO网络提供电荷平衡时,会观察到4-7型氧化物。对于间隔长度n = 3,在4型材料[H3N(CH2)(n)NH3] [V4O4(OH)2 O3P (CH)3 PO 3} 2]